US7242859B1 - Method and system for providing protection in an optical ring communication network - Google Patents
Method and system for providing protection in an optical ring communication network Download PDFInfo
- Publication number
- US7242859B1 US7242859B1 US10/625,609 US62560903A US7242859B1 US 7242859 B1 US7242859 B1 US 7242859B1 US 62560903 A US62560903 A US 62560903A US 7242859 B1 US7242859 B1 US 7242859B1
- Authority
- US
- United States
- Prior art keywords
- signal
- protection
- clockwise
- transceiver
- counter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 238000004891 communication Methods 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 230000014509 gene expression Effects 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/029—Dedicated protection at the optical multiplex section (1+1)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0297—Optical equipment protection
Definitions
- the invention relates generally to optical communication networks and in particular to methods and systems for providing protection in an optical communication network.
- Communication networks often include protection mechanisms to reroute signals in the event of a service interruption.
- Primary causes of service interruption are link failures and networking equipment failures.
- Link failures may be caused by failure of the transmission medium, such as the cut of an optical fiber cable, or by failure of an active component that affects all the optical channels on a dense wavelength division multiplexed (DWDM) link, such as an optical amplifier.
- DWDM dense wavelength division multiplexed
- a 1+1 protection scheme provides a redundant protection path for each working path.
- a switch at the receiving end of the working path can switch to receive the redundant signal on the protection path if signal quality is deteriorated on the working path.
- Another known protection scheme is 1:1 protection in which a protection path is associated with each working path, but the protection path is not utilized until signal quality is deteriorated on the working path.
- Another known protection scheme is 1:N protection in which a protection path is associated with multiple working paths. If signal deterioration is detected on one of the working paths, traffic is redirected to the protection path.
- FIG. 1 is a block diagram of a communication network having a ring architecture in an alternate embodiment of the invention
- FIG. 2 is a block diagram of a portion of a transceiver at a hub network element
- FIG. 3 is a block diagram of a remote network element of the communication network of FIG. 1 ;
- FIG. 4 is a block diagram of a remote network element of the communication network of FIG. 1 ;
- FIG. 5 is a block diagram of a communication network having a ring architecture in an alternate embodiment of the invention.
- the invention may be used in a variety of communications networks, including electrical and optical networks, and combination electrical/optical networks.
- the expression “communicates” as used herein refers to any connection, coupling, link or the like by which signals carried by one system element are imparted to the “communicating” element. Such “communicating” devices are not necessarily directly connected to one another and may be separated by intermediate components or devices. Likewise, the expressions “connected” and “coupled” as used herein are relative terms and do not require a direct physical connection.
- FIG. 1 is block diagram of a communication network 104 having a ring architecture. Shown in FIG. 1 is a hub network element 110 and a plurality of remote network elements 120 arranged in a ring configuration. Both the hub network element 110 and the remote network elements 120 transmit and receive signals in both the clockwise and counter-clockwise directions around the ring.
- the ring network may use wavelength division multiplexing (WDM) in which distinct wavelengths are used to define multiple channels on one path.
- WDM wavelength division multiplexing
- FIG. 2 illustrates transmit and receive paths in transceivers 32 and 34 .
- an optical splitter 40 divides the transmitted signal into two diverse communication paths (clockwise and counter-clockwise).
- An optical selector 50 selects the higher quality signal received on the diverse communication paths.
- the clockwise and counter-clockwise paths provide the 1+1 optical path protection.
- FIG. 3 is block diagram of one remote network element 120 .
- the remote network element includes a service component 130 and a protection component 140 .
- the service component 130 includes a first receiver 132 for receiving signals on one of the diverse communication paths (e.g., clockwise).
- a second receiver 134 receives signals on the other diverse communication path (e.g., counter-clockwise).
- the received signal having the higher quality is selected by optical selector 50 and directed to a service interface 136 .
- the service interface 136 provides an ingress and egress point to the ring network for users.
- the protection component 140 is used when a transceiver 32 is not operational and protection transceiver 34 is activated.
- each transceiver 32 sends and receives signals on a separate wavelength. If one of transceiver 32 fails, protection transceiver 34 is activated to replace the missing wavelength.
- the protection transceiver 34 generates a signal around 1300 nm, such as 1310 nm.
- the protection component 140 of remote node 120 includes an optical add/drop multiplexer 142 (OADM), an optical-to-electrical (O/E) converter 143 and an electrical-to-optical (O/E) converter 144 .
- the OADM 142 selects a protection signal having the protection wavelength (e.g., 1310 nm) and directs the protection signal to the O/E converter 143 .
- Switches 145 and 146 can couple the O/E converter 143 to the E/O converter 144 to place the OADM in loop-back mode.
- switches 145 and 147 may be configured to couple the O/E converter 145 to first and second transceivers 132 and 134 in the service component 130 .
- switches 146 and 148 may be configured to coupled the E/O converter 144 to first and second transceivers 132 and 134 in the service component 130 .
- the protection component 140 serves as a protection transceiver. Operation of switches 145 – 148 are described in detail herein.
- network element 110 receives traffic for distribution on the ring through switch 26 .
- Switch 26 is programmed to distribute traffic to transceivers 32 as established through provisioning.
- the signals provided to the transceivers 32 are directed around the ring in both the clockwise and counter-clockwise directions.
- Transceivers 132 and 134 at the remote network elements 120 receive signals and either route the signals off the ring through optical selector 50 and service interface 136 or regenerate the signal and redirect the signal back on the ring.
- FIG. 3 illustrates the status of the protection component 140 when the ring is in normal operation.
- Switches 145 and 146 are configured so that the output of O/E converter 143 is coupled directly to the input of E/O converter 144 .
- This mode is referenced as loop-back mode.
- Any signal on the protection wavelength may be enhanced (e.g., subject to 3R regeneration of re-amplification, reshaping and retiming) and placed back on the ring for distribution to the next network element.
- the optical selector 50 in hub network element 110 and selector 50 in remote network elements 120 will select the signal having the higher signal quality.
- the diverse communication paths provide redundant signals in order to provide the optical path protection.
- optical interface protection is enacted as follows. For illustration, assume that transceiver 32 1 directing traffic to remote network element 120 1 fails.
- the service component 130 detects a transceiver failure as both transceiver 132 and transceiver 134 experiencing a loss of signal (LOS).
- the service component 130 signals protection component 140 to enter a protection mode.
- switch 145 is configured to coupled the O/E converter 143 to the receive input of transceivers 132 or 134 .
- Switch 146 is configured to connect the E/O converter 144 to the transmit output of transceivers 132 or 134 .
- hub network element 110 detects failure of transceiver 32 1 and activates protection transceiver 34 .
- protection transceiver 34 operates at a wavelength (e.g., 1310 nm) that is selected by OADM 142 .
- Switch 26 directs incoming traffic destined for the failed transceiver 32 1 to the protection transceiver 34 .
- the protection transceiver 34 then transmits the signal on the protection wavelength in both directions around the ring.
- the OADM 142 retrieves the protection wavelength from the ring and directs the received signal to clockwise transceiver 132 or counter-clockwise transceiver 134 .
- Selector 50 selects the correct transceiver (CW or CCW) based on the configuration of switches 147 and 148 for distribution to the service interface 136 .
- Incoming signals from the service interface 136 are directed to either the transceiver 132 or transceiver 134 .
- the incoming signal is directed to the E/O converter 144 through switches 148 and 146 .
- the E/O converter 144 puts the signal on the protection wavelength and the OADM 142 then places the signal on the ring.
- the remaining remote nodes 120 2 and 120 3 have the protection component 140 in loop-back mode and direct the protection wavelength back to hub network element 110 .
- the system may be configured such that the protection wavelength is not available to any other remote node on the network or priorities may be established to ensure that the service with the highest priority always has protection available.
- FIG. 5 depicts an alternate embodiment in which signals transmitted by transceivers 132 and 134 may be multiplexed by a multiplexer 152 .
- multiplexer 152 may combine multiple signals through time division multiplexing (TDM). This provides the ability to protect multiple wavelengths using the single protection wavelength.
- TDM time division multiplexing
- the protection transceiver 34 , OADM 142 , O/E converter 143 and E/O converter 144 may operate at a protection wavelength around 1300 nm (e.g., 1310 nm). Such components are widely available and relatively inexpensive. Thus, effective 1:N protection may be achieved without substantial cost.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/625,609 US7242859B1 (en) | 2002-07-24 | 2003-07-24 | Method and system for providing protection in an optical ring communication network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US39827602P | 2002-07-24 | 2002-07-24 | |
US10/625,609 US7242859B1 (en) | 2002-07-24 | 2003-07-24 | Method and system for providing protection in an optical ring communication network |
Publications (1)
Publication Number | Publication Date |
---|---|
US7242859B1 true US7242859B1 (en) | 2007-07-10 |
Family
ID=38227103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/625,609 Active 2025-07-31 US7242859B1 (en) | 2002-07-24 | 2003-07-24 | Method and system for providing protection in an optical ring communication network |
Country Status (1)
Country | Link |
---|---|
US (1) | US7242859B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050111372A1 (en) * | 2002-02-22 | 2005-05-26 | Siemens Aktiengesellschaft | Local network, particularly ethernet network having redundancy properties, and coupling device for such a network |
US20100266279A1 (en) * | 2004-02-17 | 2010-10-21 | Santosh Kumar Sadananda | Multiple redundancy schemes in an optical network |
US20100329686A1 (en) * | 2009-06-30 | 2010-12-30 | Frankel Michael Y | Optical communication systems and methods utilizing a split amplification band and nonlinear compensation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020181037A1 (en) * | 2001-06-01 | 2002-12-05 | Richard Lauder | Failure protection switching in optical network |
US6567194B1 (en) * | 1998-08-17 | 2003-05-20 | Corvis Corporation | Optical communication network and protection methods |
-
2003
- 2003-07-24 US US10/625,609 patent/US7242859B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6567194B1 (en) * | 1998-08-17 | 2003-05-20 | Corvis Corporation | Optical communication network and protection methods |
US20020181037A1 (en) * | 2001-06-01 | 2002-12-05 | Richard Lauder | Failure protection switching in optical network |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050111372A1 (en) * | 2002-02-22 | 2005-05-26 | Siemens Aktiengesellschaft | Local network, particularly ethernet network having redundancy properties, and coupling device for such a network |
US7385919B2 (en) * | 2002-02-22 | 2008-06-10 | Siemens Aktiengesellschaft | Local network, particularly Ethernet network having redundancy properties, and coupling device for such a network |
US20100266279A1 (en) * | 2004-02-17 | 2010-10-21 | Santosh Kumar Sadananda | Multiple redundancy schemes in an optical network |
US20100329686A1 (en) * | 2009-06-30 | 2010-12-30 | Frankel Michael Y | Optical communication systems and methods utilizing a split amplification band and nonlinear compensation |
US8280258B2 (en) * | 2009-06-30 | 2012-10-02 | Ciena Corporation | Optical communication systems and methods utilizing a split amplification band and nonlinear compensation |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7174096B2 (en) | Method and system for providing protection in an optical communication network | |
US7321729B2 (en) | Optical ring network with selective signal regeneration and wavelength conversion | |
US7483629B2 (en) | Optical transmission systems including optical protection systems, apparatuses and methods | |
US6775477B2 (en) | Optical communication network and protection methods | |
EP0878079B1 (en) | Self-healing network | |
US6701085B1 (en) | Method and apparatus for data transmission in the wavelength-division multiplex method in an optical ring network | |
US20200228197A1 (en) | Optical switch with path continuity monitoring for optical protection switching | |
US6661972B1 (en) | Method and apparatus for transparent optical communication with two-fiber bidirectional ring with autoprotection and management of low priority traffic | |
US7483637B2 (en) | Optical ring network with optical subnets and method | |
US6968130B1 (en) | System and method for fully utilizing available optical transmission spectrum in optical networks | |
US7302180B2 (en) | Dual homing for DWDM networks in fiber rings | |
EP1501225A2 (en) | System and method for communicating optical traffic between ring networks | |
US20050036444A1 (en) | WDM bidirectional add/drop self-healing hubbed ring network | |
EP0928082B1 (en) | Method and apparatus for transparent optical communication with two-fiber bidirectional ring with autoprotection and management of low priority traffic | |
US7242859B1 (en) | Method and system for providing protection in an optical ring communication network | |
CA2448641A1 (en) | Virtual protection channel for fiber optic ring network | |
EP0931392B1 (en) | Apparatus and method for restoring fiber optic communications network connections | |
US6735390B1 (en) | Method and apparatus for terminating optical links in an optical network | |
JPH11266201A (en) | Method and device for transmitted optical communication by two fiber type bidirectional ring equipped with low priority order traffic automatic protection and management | |
WO2002007348A1 (en) | Hybrid optical shared protection ring |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CIENNA CORPORATION, MARYLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DASIKA, PRASAD;SPEARS, DAN;REEL/FRAME:014323/0921 Effective date: 20030723 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: CIENA CORPORATION, MARYLAND Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE CORRECT ASSIGNOR NAME PREVIOUSLY RECORDED ON REEL 014323 FRAME 0921;ASSIGNORS:DASIKA, PRASAD;SPEARS, DAN;REEL/FRAME:023103/0018 Effective date: 20030723 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
AS | Assignment |
Owner name: DEUTSCHE BANK AG NEW YORK BRANCH, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:CIENA CORPORATION;REEL/FRAME:033329/0417 Effective date: 20140715 |
|
AS | Assignment |
Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, NO Free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:CIENA CORPORATION;REEL/FRAME:033347/0260 Effective date: 20140715 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 12 |
|
AS | Assignment |
Owner name: CIENA CORPORATION, MARYLAND Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:DEUTSCHE BANK AG NEW YORK BRANCH;REEL/FRAME:050938/0389 Effective date: 20191028 |
|
AS | Assignment |
Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, ILLINO Free format text: PATENT SECURITY AGREEMENT;ASSIGNOR:CIENA CORPORATION;REEL/FRAME:050969/0001 Effective date: 20191028 |
|
AS | Assignment |
Owner name: CIENA CORPORATION, MARYLAND Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:BANK OF AMERICA, N.A.;REEL/FRAME:065630/0232 Effective date: 20231024 |